I get calls from this number.  No one talks but there is background noise.  How can I stop them?

I get calls from this number. ?No one talks but there is background noise.  How can I stop them?

male African accent said he has some government Insurance refund & asked if i owner of business then hang up. tried calling  back the number but nothing on the other end.

This f'n number keeps calling my pay-per-use cell phone and it's nothing but a pitch about a credit card.  Each time the option to remove yet they continue to call, costing me money.  The only solution I can think of is to cancel all my phones.

Claimed to be 'James' from Forde Home Service offering duct cleaning services.  When I asked questions about the 'offer' he hung up on me.  Why is this sort of call ok?

Looking at this site I'm half afraid the voice-mail is a way to collect messages or info through registrations on this site.  Or to get people to sign in on this site.

I got someone babbling in a language other than English or French, possibly middle-eastern, punctuated by bouts of giggling.  Male voice.  I didn't listen to the whole thing, but it was apparently 54 minutes and supposedly came some time after 2pm.  

I'm in Toronto.  I assumed it would be a local call.  May be a cell since it wasn't on 411.

I hope somebody nails these idiots.  But then we also live in a world where laws against credit card fraud and identity theft are under reported.